[ENV][D18] Configure env boot commands to use the eeprom based seco_device_config

This commit enables the functionality from the last commits for the D18.
This is done by changing the MACRO for the fdt_overlay_load2ram command
to a new implementation.
As it also takes into account the settings from seco_config and needs
settings in the devicetree to use the eeprom settings, it will change
the uboot messages also for other D18 platforms but not change the boot
behavior.

[ENV][SECO] Adapt env cmd

include/configs/seco_imx8mp_d18.h

@@ -245,6 +245,31 @@
 
 #define ENV_BOOT_TYPE                      booti
 
+#define SECO_EEPROM_I2C_BUS                    0x04
+#define SECO_EEPROM_I2C_ADDR                   0x50
+
 #include "seco_mx8_env.h"
 
+
+#ifdef CONFIG_OF_LIBFDT_OVERLAY
+#undef MACRO_ENV_FDT_LOAD_OVERLAY_BASE
+/* Here we overwrite the the fdt_overlay_load2ram command, to take the
+   seco_device_config (from eeprom) into account.
+   As this is currently only used for D18-MV this is implemented in the D18
+   header for now.
+   The fdt_overlay_load2ram is called in the default boot_cmd and also in the
+   seco_boot.scr used to boot clea-os-things.
+*/
+
+#define MACRO_ENV_FDT_LOAD_OVERLAY_BASE \
+	fdt addr ${fdt_loadaddr}; fdt resize ${fdt_resize}; \
+	if test -n "${fdt_overlay_carrier_file}"; then run fdt_overlay_carrier_cmd; fi; \
+	seco_config fdtoverlay ; \
+	seco_eeprom_manager env SECO_EEPROM_I2C_BUS SECO_EEPROM_I2C_ADDR; \
+	run fdt_overlay_apply_all; \
+	if test -n "${fdt_overlay_per_cmd}"; then run fdt_overlay_per_cmd; fi; \
+
+
+#endif
+
 #endif